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JP3201338

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP3201338
An object of the present invention is to provide a speaker which reduces occurrence of a steady
wave and sound leakage of a reflected sound by devising the shape of a housing as an enclosure.
SOLUTION: A speaker main body 30 is provided outward in the axial direction at both axial end
portions of a housing 10 as an enclosure made of a circular arc cylinder. By providing the
pedestal portion 11 in the housing 10, it is possible to place the speaker in the upright posture or
the lying posture. An opening 14 for circulating air is provided in the wall of the housing 10. The
speaker body 30 is accommodated in the induction ducts 51, 61 as inner cases, and the
induction ducts 51, 61 are provided with the outlets 52, 62 squeezed in a streamlined shape, and
the outlets 52, 62 are formed at the locations where the openings are formed. Turn. [Selected
figure] Figure 10
スピーカー
[0001]
The present invention relates to a speaker, and more particularly to a speaker in which measures
are taken to reduce the occurrence of a standing wave (standing wave) inside the enclosure due
to the back pressure pulsation generated by the vibration of the diaphragm of the speaker body.
[0002]
FIG. 11 is a schematic perspective view of a loudspeaker according to a conventional example,
and FIG. 12 is a schematic longitudinal side view of the loudspeaker of FIG.
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The speakers shown in FIGS. 11 and 12 are stereotypes, and dynamic speaker bodies 30, 30 are
attached to the left and right two speaker attachment ports 20, 20 of a hollow hexahedron
enclosure 10 as a closed enclosure, respectively. ing.
[0003]
In this type of speaker, the rear of the speaker main body 30 is covered and sealed by the
enclosure, so that the sound emitted from the back surface of the diaphragm of the speaker main
body 30 is sealed. Therefore, the case 10 exerts a function of preventing the sound emitted from
the back of the speaker body 30 into the space S in the case from being enclosed and interfering
with the sound emitted from the front surface of the speaker body 30 to the outside of the case.
[0004]
However, the front panel and the rear panel of the housing 10 and the right and left lateral
panels face each other, and each panel is flat, so that the sound from the back of the speaker
main body 30 to the space S in the housing is The sound reflected by each of the abovementioned panels is synthesized to generate a standing wave (standing wave) as exemplified by
the arrows that adversely affect the sound quality of the speaker, or the reflected sound of the
middle to high range is It is said that there is a problem of leaking outside. A standing wave
(standing wave) can be created by two waves with the same wavelength, period, amplitude, etc.,
but with the same direction of travel, but with opposite directions, so that the waveform does not
move and it stops and vibrates in the field It is a wave that looks like
[0005]
On the other hand, a hollow hexahedral cabinet (corresponding to an enclosure) is disclosed in
Patent Document 1 as a prior example. Is divided by the partition member into a first space and a
second space, and the front panel of the first space is a dynamic speaker means (corresponding
to a speaker main body). A speaker system is disclosed in which the partition member is provided
with a drone cone, and the front panel of the second space is provided with a port pipe. In this
speaker system, the port tube exerts the function of enhancing the resonance of the low-pitched
sound emitted to the back of the speaker body and emitting it to the outside of the housing on
the principle of Hertzholm resonance.
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[0006]
As can be seen in the speaker system shown in Patent Document 1, the speaker known in the
prior art generates standing waves (standing waves) as described above because the enclosure as
the enclosure is constituted by a hollow hexahedron. And there is a problem that reflected sound
in the middle and high range leaks out of the case. Therefore, as a measure for reducing the
occurrence of a steady wave and the sound leakage of a reflected sound, a measure of loading a
sound absorbing material (a sound deadening material) into the inside of the casing was
sometimes taken.
[0007]
Japanese Utility Model Application Publication No. 3-51598
[0008]
This invention is made in view of the above condition, and aims at reducing the sound leak of a
generation | occurrence | production of a standing wave and a reflected sound by devising the
shape of the housing | casing as an enclosure.
Moreover, this invention aims at reducing further the sound leakage of generation | occurrence |
production of a standing wave and a reflected sound by adding a fixed measure to the shape of
the devised housing | casing.
[0009]
A speaker according to the present invention is a speaker in which a dynamic type speaker main
body is accommodated in an enclosure, and the speaker main body is provided at each of both
axial end portions of a housing as the enclosure which is an arc-shaped cylindrical body. But are
mounted outward in the axial direction.
[0010]
According to the speaker configured in this manner, the inside of the cylindrical enclosure is
formed of a curved surface by forming the enclosure as the enclosure with an arc-shaped
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cylinder, and the opposing wall surfaces also have curved surfaces facing each other. Because the
sound from the back of the speaker body to the space inside the case is reflected and it becomes
difficult to be synthesized, it not only helps to suppress the generation of standing waves, but it
also makes it so loud Reflected sound in the region is also less likely to occur.
[0011]
In the present invention, the first seating surface which enables the speaker to be placed in the
standing posture in which the speaker body is upward, and the lying posture in which the
speaker body is in the lateral direction, are mounted outside the housing. Preferably, a second
seating surface is provided which makes it possible to position.
With this configuration, the orientation of the speaker main body can be changed according to
the preference of the user of the speaker, and the sound heard by the user can be changed
according to the posture of the speaker.
[0012]
In the present invention, a configuration may be adopted in which a partition plate is provided in
the axial center of the housing to divide the internal space of the housing into two independent
left and right first and second spaces. It is possible.
According to this configuration, the speaker main bodies mounted on both axial end portions of
the housing as the enclosure formed by the arc-shaped cylinder, are respectively provided in the
respective independent first and second spaces. Being positioned, it is less likely that the sounds
coming from the back of both speaker bodies interfere with each other to reduce the sound
quality.
[0013]
In the present invention, it is desirable that the wall portion of the housing be provided with an
opening that allows the internal space of the housing and the outside of the housing to
communicate with each other to allow air flow. With this configuration, the opening exerts the
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function of the port pipe shown in the above-mentioned Patent Document 1. Therefore, the
function of enhancing the resonance and emitting the sound of the low frequency range emitted
to the back of the speaker main body to the outside of the housing by the principle of the
Hertzholm resonance is exhibited.
[0014]
In the present invention, the opening is provided at the central portion in the axial direction of
the wall of the housing, and the inner space of the housing is provided on both sides in the axial
direction sandwiching the location where the opening is formed. A pair of partition plates are
provided to divide the left and right two independent first and second spaces and the third space
located between the two spaces and facing the opening, one side of which is the partition plate A
first through-hole of air flow is provided which mutually connects the first and third spaces, and
a second through-hole of air flow which mutually connects the second and third spaces is
provided on the other side of the partition plate. Can be adopted. Even with this configuration, it
is less likely that the sounds coming from the back of both speaker bodies interfere with each
other to deteriorate the sound quality.
[0015]
In the present invention, the speaker body provided at each of both axial end portions of the
housing is accommodated in a guiding duct as an inner case attached to the housing, and the
guiding duct is a streamline It is desirable to employ a configuration having an outlet that is
constricted to a shape and that the outlet is directed to the location where the opening is formed.
According to this configuration, it is less likely that the sounds from the back of both speaker
bodies interfere with each other to reduce the sound quality, and the sound from the back of the
speaker body is squeezed into the streamline shape of the induction duct. When coming out of
the exit, the sound from the exit is difficult to return to the inside of the induction duct.
Therefore, it helps to control the deterioration of the sound quality of the speaker body due to
the sound from the outlet returning to the inside of the induction duct. Moreover, since the inner
walls of the induction ducts are all formed by curved surfaces, they help to suppress the
generation of standing waves.
[0016]
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In the present invention, it is desirable that a sound absorbing material be loaded in a
predetermined area of the internal space of the housing facing the opening. Adopting this
configuration further reduces the occurrence of stationary waves and the leakage of reflected
sound.
[0017]
As described above, according to the speaker according to the present invention, the shape of the
enclosure as the enclosure achieves the effect of reducing the occurrence of the steady wave and
the sound leakage of the reflected sound.
[0018]
FIG. 1 is a perspective view of a speaker according to a first embodiment of the present
invention.
It is explanatory drawing of the state which mounted the speaker of FIG. 1 in the standing
posture. It is explanatory drawing of the state which mounted the speaker of FIG. 1 in the lying
posture. It is a vertical front view of the speaker of FIG. It is a longitudinal front view showing a
speaker concerning a 2nd embodiment of the present invention. It is a vertical side view of the
speaker of FIG. It is the vertical side view which showed the principal part of the modification. It
is a vertical front view of the speaker concerning a 3rd embodiment of the present invention. It is
a longitudinal front view of the speaker concerning a 4th embodiment of the present invention. It
is a longitudinal front view of the speaker concerning a 5th embodiment of the present invention.
It is a schematic perspective view of the speaker by a prior art example. It is a schematic
longitudinal side view of the speaker of FIG.
[0019]
FIG. 1 is a perspective view showing a speaker according to a first embodiment of the present
invention, FIG. 2 is an explanatory view of a state in which the speaker of FIG. 1 is placed in an
upright posture, FIG. 3 is mounted on the loudspeaker of FIG. FIG. 4 is a longitudinal front view
of the speaker of FIG. 1;
[0020]
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As shown in FIG. 1 or FIG. 4, the speaker according to this embodiment is a stereotype provided
with a pair of dynamic type speaker bodies 30 and 30, and both ends of the housing 10 as an
enclosure in the axial direction In each of the above, the speaker bodies 30, 30 are provided
outward in the axial direction.
The housing 10 is an arc-shaped cylinder. Further, a pedestal portion 11 is provided outside the
central portion in the axial direction of the housing 10. As shown in FIGS. 2 and 3, the pedestal
11 has first and second seating surfaces 12 and 13 orthogonal to each other. Then, when the
speaker is placed on a fixed surface (not shown) such as a floor surface or a table surface using
the first seating surface 12, the speaker is in the upright posture as shown in FIG. . When the
second seating surface 13 is mounted on the fixed surface (not shown), the speaker is in the lying
position as shown in FIG. Therefore, the orientation of the speaker body 30 can be changed
according to the preference of the user, and the sound heard by the user can be changed
according to the posture of the speaker.
[0021]
According to the speaker configured as described above, the sound emitted from the speaker
main body 30 toward the front thereof is emitted to the outside of the housing 10 through the
end opening of the housing 10. On the other hand, the sound of the diaphragm of the speaker
body 30 vibrating and coming out to the internal space S at the back collides with or is reflected
on the inner surface of the housing 10 as exemplified by the arrow in FIG. In this case, most of
the sound colliding with or reflecting on the inner surface of the housing 10 collides with the
curved surface of the inner surface of the housing 10 and diffuses because the housing 10 is
curved in an arc shape in the axial direction. Will be reflected. Therefore, a phenomenon in which
sounds colliding or reflected on the inner surface of the housing 10 are not combined easily
occurs, generation of a stationary wave is suppressed accordingly, and reflected sound in the
middle to high range becomes difficult to be generated. As a result, according to the speaker of
this embodiment, the occurrence of the stationary wave and the sound leakage of the reflected
sound are reduced simply by the fact that the enclosure 10 as the enclosure is constituted by the
arc-shaped cylinder, and the sound quality is improved It becomes possible to provide a good
speaker. Although not shown, such a stationary wave suppressing action and a reflected sound
suppressing action can be more remarkably exhibited by loading a sound absorbing material
(silencing material) made of a fibrous material or the like in the housing 10.
[0022]
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FIG. 5 is a front elevational view showing a loudspeaker according to a second embodiment of
the present invention, FIG. 6 is a longitudinal sectional view showing the loudspeaker of FIG. 5 in
longitudinal section, and FIG. 7 is a longitudinal sectional view showing the main part of a
modification. This embodiment corresponds to the above-described speaker of the first
embodiment in which the opening 14 is provided in the wall of the housing 10. The opening 14
communicates the internal space of the housing 10 with the outside of the housing 10 to allow
air flow.
[0023]
According to the speaker of this embodiment, the opening 14 exerts an effect of enhancing the
resonance of the sound in the low frequency range emitted to the back of the speaker main body
30 on the principle of Herzholm resonance and emitting the sound to the outside of the housing
10. Therefore, the steady wave suppressing action and the reflected sound suppressing action
exerted by the speaker of the first embodiment synergize with the action of enhancing the
resonance of the sound in the low frequency range by the opening 14 and emitting the sound to
the outside of the housing. The sound quality of will be further improved. Also in the speaker
according to the second embodiment, the stationary wave suppressing function and the reflected
sound suppressing function can be more remarkably exhibited by loading the sound absorbing
material (muffling material) made of a fibrous material or the like in the housing 10. It will be. In
particular, in the second embodiment, the opening 14 is provided at the axial center of the wall
of the housing 10. Therefore, the sound of the reverse phase which comes out to those backs
from each of a pair of speaker main bodies 30 and 30 is escaped outside with good balance, as
shown by the arrow in FIG. By this, it becomes easy to exhibit a standing wave suppression effect
| action and a reflected sound suppression effect | action. In the second embodiment, as shown in
FIG. 7, the opening 14 may of course be formed by a port pipe.
[0024]
FIG. 8 is a longitudinal front view of a loudspeaker according to a third embodiment of the
present invention. In this embodiment, a partition plate 15 is provided at a central portion in the
axial direction of a housing 10 formed of an arc-like cylinder, and the partition plate 15 allows
the internal space of the housing 10 to be two independent first and second It is divided into 2nd
space S1 and S2. Then, openings 14 and 14 facing the first and second spaces S1 and S2 are
respectively provided in the vicinity of the partition plate 15 in the wall portion of the housing 1.
In this embodiment, the openings 14 facing the first and second spaces S1 and S2 have a
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function of communicating the spaces S1 and S2 with the outside of the housing 10 to enable air
flow. Demonstrate.
[0025]
According to the speaker of this embodiment, the partition plate 15 exerts the function of
preventing the interference of the negative phase sound generated individually in the first space
S1 and the second space S2. In addition, the openings 14 and 14 exert an effect of enhancing the
resonance of the sound in the low frequency range emitted to the back of the left and right
speaker bodies 30 and 30 according to the principle of Herzholm resonance and emitting the
sound to the outside of the housing 10. Therefore, the above-mentioned steady wave suppression
action and reflected sound suppression action are synergistically enhanced with the action of
resonance enhancement of the sound in the low frequency range by the opening 14 and the
release to the outside of the casing, thereby further improving the sound quality of the speaker .
Also in the speaker of this embodiment, the stationary wave suppressing function and the
reflected sound suppressing function can be more remarkably exhibited by loading the sound
absorbing material (muffling material) made of a fiber material or the like in the housing 10.
Become. Also in this embodiment, the opening 14 may be formed by a port tube.
[0026]
FIG. 9 is a front elevational view of a loudspeaker according to a fourth embodiment of the
present invention. In this embodiment, an opening 14 is provided at the central portion in the
axial direction of the wall of the housing 10 which is an arc-shaped cylinder. Further, on both
sides in the axial direction of the case 10 sandwiching the formation portion of the opening 14,
the internal space of the case 10 is divided into two independent first and second spaces S1 and
S2 and two spaces A pair of partition plates 16 and 17 are provided which are located between
S1 and S2 and are divided into a third space S3 facing the opening 14. The first through hole 18
of the air flow connecting the first and third spaces S1 and S3 to each other is provided in the
partition plate 16 on one side, and the second and third spaces S2 are provided in the partition
plate 17 on the other side. , S3 are mutually connected, and the second through hole 19 of the air
flow is provided. In this embodiment, the opening 14 facing the third space S3 exhibits the
function of communicating the third space S3 with the outside of the housing 10 to enable air
flow.
[0027]
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According to the speaker of this embodiment, the pair of partition plates 16 and 17 exerts the
function of preventing the interference of the antiphase sound generated individually in the first
space S1 and the second space S2. In addition, the above-mentioned steady wave suppression
action and reflected sound suppression action synergize with the action of resonance
enhancement of the sound of the low sound range by the opening 14 and the release to the
outside of the casing, and the sound quality of the speaker is further improved. . In the
loudspeaker according to this embodiment, the stationary wave suppressing function and the
reflected sound suppressing function can be more remarkably exhibited by loading the sound
absorbing material (muffling material) made of a fibrous material or the like in the third space
S3. become. Also in this embodiment, the opening 14 may be formed by a port pipe.
[0028]
FIG. 10 is a front elevational view of a loudspeaker according to a fifth embodiment of the
present invention. In this embodiment, as in the configuration shown in FIG. 5, an opening 14 is
provided at the central portion in the axial direction of the wall of the housing 10 formed of a
circular arc cylinder. The opening 14 communicates the internal space S of the housing 10 with
the outside of the housing 10 to exhibit the function of enabling air flow. Therefore, the opening
14 exerts an effect of resonance-enhancing the sound of the low-pitched range emitted to the
back of the speaker main body 30 on the principle of Herzholm resonance and emitting it to the
outside of the housing. Therefore, the above-mentioned steady wave suppression action and
reflected sound suppression action are synergistically enhanced with the action of resonance
enhancement of the sound in the low frequency range by the opening 14 and the release to the
outside of the casing, thereby further improving the sound quality of the speaker .
[0029]
In the speaker of this embodiment, a sound absorbing material 40 made of a fibrous material or
the like is loaded in a predetermined region of the internal space S of the housing 10 facing the
opening 14, and the sound absorbing material 40 can be used to suppress standing waves or
reflect sound. The inhibitory effect is more pronounced. Further, in the fifth embodiment, since
the opening 14 is provided at the central portion in the axial direction of the wall of the housing
10, the sound of the opposite phase emitted from the pair of left and right speaker bodies 30, 30
to their backs However, it will be released to the outside in a well-balanced manner, and the
steady wave suppressing action and the reflected sound suppressing action will be more easily
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exhibited. Also in this embodiment, the opening 14 may be formed by a port tube.
[0030]
In particular, in this embodiment, the speaker main bodies 30 and 30 provided at each of both
axial end portions of the housing 10 are accommodated in the induction ducts 51 and 61 as the
inner case attached to the housing 10 These induction ducts 51, 61 have outlets 52, 62 which
are squeezed into a streamlined shape, and their outlets 52, 62 point towards the formation of
the opening 14. By adopting this configuration, it becomes less likely that the sounds coming out
of the back of the left and right speaker bodies 30, 30 interfere with each other to lower the
sound quality, and the sounds coming out of the outlets 52, 62 Is difficult to return to the inside
of the induction ducts 51, 61. Therefore, the fall of the sound quality of the speaker main bodies
30 and 30 by the sound which came out of the outlets 52 and 62 returning to the inside of the
induction | guidance | derivation ducts 51 and 61 is suppressed. Moreover, since the inner walls
of the induction ducts 51 and 61 are all formed of curved surfaces, they help to suppress the
generation of stationary waves.
[0031]
In FIGS. 1 to 12, the same or corresponding elements are denoted by the same reference
numerals to facilitate understanding of the configuration and to avoid duplicating descriptions.
[0032]
Reference Signs List 10 housing 12 first seating surface 13 second seating surface 14 opening
15 partition plate 16, 17 partition plate 18 first through hole 19 second through hole 30 speaker
main body 51, 61 induction duct 52, 62 outlet 40 sound absorbing material S Internal space S1
of the case First space S2 Second space S3 Third space
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